function changenational(str, pleaseselect) {//国家联动下拉省
	jQuery.post("getprovince.html", {
		national : str
	}, function(data) {
		try {
			jQuery("#province option[id='old']").remove(); //删 除Select的Option
			jQuery("#province").append(
					"<option id='old' value='province' >" + pleaseselect
							+ "</option>");//拼一个空值 ch
			jQuery.each(data.province, function(idx, item) {
				jQuery("#province").append(
						"<option id='old' value='" + idx + "' >" + item
								+ "</option>"); //为Select追加一个Option(下拉项)
				});
		} catch (e) {
			alert("Error in XML response:" + e);
		}
	}, 'JSON');
}
function changeprovince(str, pleaseselect) {//省联动下拉县
	jQuery.post("getcounty.html", {
		province : str
	}, function(data) {
		try {
			jQuery("#county option[id='old']").remove(); //删 除Select的Option
			jQuery("#county").append(
					"<option id='old' value='county' >" + pleaseselect
							+ "</option>");//拼一个空值 ch
			jQuery.each(data.county, function(idx, item) {
				jQuery("#county").append(
						"<option id='old' value='" + idx + "' >" + item
								+ "</option>"); //为Select追加一个Option(下拉项)
				});
		} catch (e) {
			alert("Error in XML response:" + e);
		}
	}, 'JSON');
}
